move readthedocs config into subdir

.github/.readthedocs.yaml

@@ -0,0 +1,26 @@
+# Read the Docs config for https://docs.archivebox.io
+# https://docs.readthedocs.io/en/stable/config-file/v2.html
+
+version: 2
+
+submodules:
+  include: all
+  recursive: true
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+    #nodejs: "20"     # not needed unless we need the full archivebox to run while building docs for some reason
+
+sphinx:
+  configuration: docs/conf.py
+
+formats:
+  - pdf
+  - epub
+
+# https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+  install:
+    - requirements: docs/requirements.txt